— Why didn’t you give a hand to the boy?— I _______, but he strggled to his feet before I tried to.
Parents have a duty to ____ their children from the harmful effects of the Internet.
Qiandao Lake, widely known ______ a tourist site, is famous _____ its clear and drinkable water.
We have every reason to believe that __________ 2012 London Olympics will be ________ great success.
—Madam, could you please tell me how to get to the nearest post office? —_______
Entering the room, I found Mary ______at the desk and ______a letter.